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Fwd: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs]

From: Andy Seaborne <andy.seaborne@epimorphics.com>
Date: Tue, 29 Mar 2011 11:51:58 +0100
Message-ID: <4D91B9CE.5000501@epimorphics.com>
To: SPARQL Working Group <public-rdf-dawg@w3.org>
Seems to me to be better to put this with the defn of RDF dataset in rq25.

This needs co-ordination with the Graphs task force of RDF-WG.

Added to "To_Last_Call"


-------- Original Message --------
Subject: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? 
[RDF Graphs]
Resent-Date: Mon, 28 Mar 2011 15:08:30 +0000
Resent-From: public-rdf-wg@w3.org
Date: Mon, 28 Mar 2011 15:07:20 +0000
From: RDF Working Group Issue Tracker <sysbot+tracker@w3.org>
Reply-To: RDF Working Group WG <public-rdf-wg@w3.org>
To: public-rdf-wg@w3.org

RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs]


Raised by: David Wood
On product: RDF Graphs

The "RDF Semantics" spec defines how to merge two or more RDF graphs,
the pain is caused by blank nodes, otherwise it's a trivial operation.

The "SPARQL Query Language for RDF" spec defines the notion of RDF
dataset as a set of "one graph, the default graph, which does not have
a name, and zero or more named graphs, where each named graph is
identified by an IRI".

How do we define how to merge RDF datasets?

One obvious answer is we merge all the default graphs and all the
named graphs with the same IRI using the procedure defined by the "RDF
Semantics" to merge RDF graphs.

NB: This issue will also relate to the "Cleanup Tasks" product if the 
RDF Semantics document will need to change in relation to named graphs.

At Talis, within the Talis Platform, we want to enable people to
easily merge RDF graphs into an RDF dataset and perhaps RDF datasets
into another RDF dataset. We also want to have these merge happen in
real-time (i.e. as you add/remove triples from the graphs you update
all the derived graphs/datasets).

Thanks to Paolo Castagna of Talis for providing input to this issue.
Received on Tuesday, 29 March 2011 10:52:34 UTC

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